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Full Discussion: C code : Segmentation fault
Top Forums Programming C code : Segmentation fault Post 302492414 by Corona688 on Monday 31st of January 2011 10:15:38 AM
Old 01-31-2011
What is your system?

What is your compiler?

In gcc/linux, compile with -ggdb and run with gdb ./a.out, then type 'run', and when it crashes, type 'bt full' to show where it crashed.

Also: Listen to the warnings the compiler gives you. to wit:

Code:
definitions.h:10: warning: 'SRC_DIR' initialized and declared 'extern'
definitions.h:11: warning: 'LOG_DIR' initialized and declared 'extern'
definitions.h:12: warning: 'TMP_DIR' initialized and declared 'extern'
definitions.h:13: warning: 'ARCH_DIR' initialized and declared 'extern'
definitions.h:16: warning: 'LOG_NAME' initialized and declared 'extern'
definitions.h:17: warning: 'FIELD_SEP' initialized and declared 'extern'
definitions.h:18: warning: 'LOG_EXT' initialized and declared 'extern'
definitions.h:19: warning: 'TMP_EXT' initialized and declared 'extern'
definitions.h:20: warning: 'TRG_EXT' initialized and declared 'extern'
definitions.h:21: warning: 'ARCH_EXT' initialized and declared 'extern'
definitions.h:22: warning: 'DIR_SEP' initialized and declared 'extern'
port.c: In function 'main':
port.c:80: warning: format '%s' expects type 'char *', but argument 2 has type 'char **'
port.c:14: warning: unused variable 'target_stream'

header files don't work that way, and extern doesn't work that way. You either want to do

Code:
#define SRC_DIR "/home/hhulaman/1516/source/"

or
Code:
extern char * SRC_DIR;

with an accompanying
Code:
#include "definitions.h"
char *SRC_DIR="/home/hhulaman/1516/source/";

in definitions.c. This prevents the variable from being redefined 19 times if it's included in 19 seperate C files.

Better yet, make them constant, so you can't overwrite them accidentally:
Code:
extern const char const * SRC_DIR;

Last edited by Corona688; 01-31-2011 at 11:22 AM..
 

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LEARN ABOUT FREEBSD

brand.4th

BRAND.4TH(8)						    BSD System Manager's Manual 					      BRAND.4TH(8)

NAME

     brand.4th -- FreeBSD ASCII art boot module

DESCRIPTION

     The file that goes by the name of brand.4th is a set of commands designed to draw the ASCII art BSD brand above the boot loader menu.  The
     commands of brand.4th by themselves are not enough for most uses.	Please refer to the examples below for the most common situations, and to
     loader(8) for additional commands.

     Before using any of the commands provided in brand.4th, it must be included through the command:

	   include brand.4th

     This line is present in the default /boot/menu.rc file, so it is not needed (and should not be re-issued) in a normal setup.

     The commands provided by it are:

	   draw-brand		  Draws the BSD brand.

				  The brand that is drawn is configured by setting the loader_brand variable in loader.conf(5) to one of ``fbsd''
				  (the default) or ``none''.

				  The position of the logo can be configured by setting the loader_brand_x and loader_brand_y variables in
				  loader.conf(5).  The default values are 2 (x) and 1 (y).

     The environment variables that effect its behavior are:

	   loader_brand
		     Selects the desired brand in the beastie boot menu. Possible values are: ``fbsd'' (default) or ``none''.

	   loader_brand_x
		     Sets the desired column position of the brand. Default is 2.

	   loader_brand_y
		     Sets the desired row position of the brand. Default is 1.

FILES

     /boot/loader      The loader(8).
     /boot/brand.4th   brand.4th itself.
     /boot/loader.rc   loader(8) bootstrapping script.

EXAMPLES

     Set FreeBSD brand in loader.conf(5):

	   loader_brand="fbsd"

SEE ALSO

     loader.conf(5), loader(8)

HISTORY

     The brand.4th set of commands first appeared in FreeBSD 9.0.

AUTHORS

     The brand.4th set of commands was written by Devin Teske <dteske@FreeBSD.org>.

BSD
								   May 18, 2011 							       BSD
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